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Missing class file

After an unintended break, I'm back to learning Java.

I'm having a problem debugging the following file. I keep getting the message: "The following file is missing class or inner class files." I'm sure I'm missing something very simple. But what is it? I'm still working on fixing the rest of the file.

Re: Missing class file

I'm using jGrasp to do the programming, but I'm starting from a web page called "Practice-It!" (I'm working from a textbook called "Building Java Programs: A Back to Basics Approach.") I've attached two screenshots: 1) the web page that gives the practice question; 2) the error message as it appears on jGrasp.